材料科学
阳极
法拉第效率
化学工程
聚合物
氧化物
碳纤维
电解质
钠
电极
复合材料
化学
冶金
物理化学
复合数
工程类
作者
Junhai Xia,An‐Hui Lu,Xiaofei Yu,Wen‐Cui Li
标识
DOI:10.1002/adfm.202104137
摘要
Abstract Hard carbon (HC) has emerged as a promising anode material for sodium‐ion batteries (SIBs), whereas it suffers from low initial Coulombic efficiency (ICE) and poor rate capability. Binders endowed with high electron/ion transport and strong mechanical integrity are expected to boost the practical application of HC anodes, which cannot be realized via the functional design of commercially available binders. Herein, a trifunctional sodium alginate (SA)/polyethylene oxide (PEO) binder with massive hydrophilic functional groups and abundant Na + is synthesized via a feasible esterification reaction. The binder forms a passivation film on glucose‐derived carbon (GC) to suppress the electrolyte decomposition and offer stronger adhesion strength. Furthermore, the sluggish Na + conduction is improved via sufficient ionic transfer channels provided by PEO. Notably, effects of Na + compensation and interfacial ionic transport of Na + ‐containing binder for HC anodes are revealed. Therefore, the SA/PEO binder for the GC anode delivers a high ICE up to 87% and a high capacity of 270 mA h g −1 at 0.1 A g −1 , both 10% and 80 mA h g −1 higher than that of poly(vinylidene fluoride) binder, respectively. Significantly, this SA/PEO binder can also be applied to coal‐based and polymer‐based carbon anodes, exhibiting universal applicability.
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